PROCESS FOR REDUCING THE SULPHUR CONTENT OF COAL AND COAL CHAR AND THE TION TEMPERATURE OF COAL CHAR

摘要

Coal and like carbonaceous materials are converted to char by heating with restricted oxygen access at a temperature not exceeding about 870.degree.C. (1600.degree.F.) and the resultant char is desulphurized by treatment with a hot liquid alkali, preferably with a molten caustic alkali such as sodium or potassium hydroxide or a mixture thereof at a temperature in the range 260-400.degree.C. (500-750.degree.F.) for a residence time of about 2 to about 30 minutes, whereafter the desulphurized char is separated form the alkali and freed from the latter as by washing with water.